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APA Citation Guide (7th Edition): Dictionaries, Thesauruses and Encyclopedias

Note: This guide reflects the latest version of the APA Publication Manual (i.e., APA 7).

Entry in an Online Dictionary, Thesaurus, or Encyclopedia, with an Individual Author


Author, A. A., & Author, B. B. (Year). Title of entry. In A. A. Editor (ed.), Title of reference work (edition). Publisher. URL


Beck, J., & Foley, D. (2010). Music composition. In B. Graves (ed.). The Canadian encyclopedia (2010 ed.). Historica Canada.

Entry in an Online Dictionary, Thesaurus, or Encyclopedia, with a Group Author


Institution or organization name. (Year). Title of entry. In Title of reference work. URL


Merriam Webster. (n.d.). Climate change. In dictionary. Retrieved June 8, 2020, from

Note: When an online reference work is continuously updated and the versions are not archived, use "n.d." as the year of publication and include a retrieval date.

Entry in Wikipedia


Title of entry. (Year, Month Date). In Wikipedia. Permalink [or URL and retrieval date]


Veterinary medicine. (2020, June 3). In Wikipedia. 


Cite the archived version of the page so that readers can retrieve the version you used. Access the archived version on Wikipedia by selecting "View history" and then the time and date of the version you used. If a wiki does not provide permanent links to archived versions of the page, include the URL for the entry and the retrieval date.

Wikipedia may not be considered an acceptable source for a college or university assignment. Be sure to evaluate the content carefully and check your assignment.